netfilter: fix several Kconfig problems in NF_LOG_*

warning: (NETFILTER_XT_TARGET_LOG) selects NF_LOG_IPV6 which has unmet direct dependencies (NET && INET && IPV6 && NETFILTER && IP6_NF_IPTABLES && NETFILTER_ADVANCED)
warning: (NF_LOG_IPV4 && NF_LOG_IPV6) selects NF_LOG_COMMON which has unmet direct dependencies (NET && INET && NETFILTER && NF_CONNTRACK)

Fixes: 83e96d4 ("netfilter: log: split family specific code to nf_log_{ip,ip6,common}.c files")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index f17b273..ad751fe 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -46,6 +46,9 @@
 
 	  To compile it as a module, choose M here.  If unsure, say N.
 
+config NF_LOG_COMMON
+	tristate
+
 if NF_CONNTRACK
 
 config NF_CONNTRACK_MARK
@@ -359,9 +362,6 @@
 	  If this option is enabled, NFQUEUE can include Connection Tracking
 	  information together with the packet is the enqueued via NFNETLINK.
 
-config NF_LOG_COMMON
-	tristate
-
 config NF_NAT
 	tristate
 
@@ -747,9 +747,7 @@
 
 config NETFILTER_XT_TARGET_LOG
 	tristate "LOG target support"
-	select NF_LOG
-	select NF_LOG_IPV4
-	select NF_LOG_IPV6
+	depends on NF_LOG_IPV4 && NF_LOG_IPV6
 	default m if NETFILTER_ADVANCED=n
 	help
 	  This option adds a `LOG' target, which allows you to create rules in